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API CHANGE: plpgsql now created if triggers are required, full text search columns and other indexes now inherited by partitioned tables

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This commit is contained in:
Geoff Munn 2009-11-24 22:46:55 +00:00
parent 08a348654c
commit ec8997bdf8
1 changed files with 87 additions and 29 deletions
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116
code/PostgreSQLDatabase.php
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@ -268,21 +268,9 @@ class PostgreSQLDatabase extends SS_Database {
if($indexes){
foreach($indexes as $name=>$this_index){
if($this_index['type']=='fulltext'){
//For full text search, we need to create a column for the index
$columns=explode(',', $this_index['value']);
for($i=0; $i<sizeof($columns);$i++)
$columns[$i]="\"" . trim($columns[$i]) . "\"";
$columns=implode(', ', $columns);
$fulltexts .= "\"ts_$name\" tsvector, ";
$triggerName="ts_{$tableName}_{$name}";
$this->dropTrigger($triggerName, $tableName);
$triggers.="CREATE TRIGGER $triggerName BEFORE INSERT OR UPDATE
ON \"$tableName\" FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger(\"ts_$name\", 'pg_catalog.english', $columns);";
$ts_details=$this->fulltext($this_index, $tableName, $name);
$fulltexts.=$ts_details['fulltexts'];
$triggers.=$ts_details['triggers'];
}
}
}
@ -307,8 +295,8 @@ class PostgreSQLDatabase extends SS_Database {
}
//If we have a partitioning requirement, we do that here:
if($extensions && $extensions['partitions']){
$this->createOrReplacePartition($tableName, $extensions['partitions']);
if($extensions && isset($extensions['partitions'])){
$this->createOrReplacePartition($tableName, $extensions['partitions'], $indexes, $extensions);
}
//Lastly, clustering goes here:
@ -1063,16 +1051,30 @@ class PostgreSQLDatabase extends SS_Database {
/**
* Create a fulltext search datatype for PostgreSQL
* This will also return a trigger to be applied to this table
*
* @todo: create custom functions to allow weighted searches
*
* @param array $spec
*/
/*function fulltext($table, $spec){
//$spec['name'] is the column we've created that holds all the words we want to index.
//This is a coalesced collection of multiple columns if necessary
$spec='create index ix_' . $table . '_' . $spec['name'] . ' on ' . $table . ' using ' . $this->default_fts_cluster_method . '(' . $spec['name'] . ');';
function fulltext($this_index, $tableName, $name){
//For full text search, we need to create a column for the index
$columns=explode(',', $this_index['value']);
for($i=0; $i<sizeof($columns);$i++)
$columns[$i]="\"" . trim($columns[$i]) . "\"";
$columns=implode(', ', $columns);
return $spec;
}*/
$fulltexts="\"ts_$name\" tsvector, ";
$triggerName="ts_{$tableName}_{$name}";
$this->dropTrigger($triggerName, $tableName);
$triggers="CREATE TRIGGER $triggerName BEFORE INSERT OR UPDATE
ON \"$tableName\" FOR EACH ROW EXECUTE PROCEDURE
tsvector_update_trigger(\"ts_$name\", 'pg_catalog.english', $columns);";
return Array('fulltexts'=>$fulltexts, 'triggers'=>$triggers);
}
/**
* This returns the column which is the primary key for each table
@ -1335,8 +1337,8 @@ class PostgreSQLDatabase extends SS_Database {
//We can't seem to change the location of the tablespace through any ALTER commands :(
//If a tablespace with this name exists, but the location has changed, then drop the current one
if($existing && $location!=$existing['spclocation'])
DB::query("DROP TABLESPACE $name;");
//if($existing && $location!=$existing['spclocation'])
// DB::query("DROP TABLESPACE $name;");
//If this is a new tablespace, or we have dropped the current one:
if(!$existing || ($existing && $location!=$existing['spclocation']))
@ -1344,14 +1346,25 @@ class PostgreSQLDatabase extends SS_Database {
}
public function createOrReplacePartition($tableName, $partitions){
public function createOrReplacePartition($tableName, $partitions, $indexes, $extensions){
//We need the plpgsql language to be installed for this to work:
$this->createLanguage('plpgsql');
$trigger='CREATE OR REPLACE FUNCTION ' . $tableName . '_insert_trigger() RETURNS TRIGGER AS $$ BEGIN ';
$first=true;
//Do we need to create a tablespace for this item?
if($extensions && isset($extensions['tablespace'])){
$this->createOrReplaceTablespace($extensions['tablespace']['name'], $extensions['tablespace']['location']);
$tableSpace=' TABLESPACE ' . $extensions['tablespace']['name'];
} else
$tableSpace='';
foreach($partitions as $partition_name=>$partition_value){
//Check that this child table does not already exist:
if(!$this->TableExists($partition_name)){
DB::query("CREATE TABLE $partition_name (CHECK (" . str_replace('NEW.', '', $partition_value) . ")) INHERITS (\"$tableName\");");
DB::query("CREATE TABLE \"$partition_name\" (CHECK (" . str_replace('NEW.', '', $partition_value) . ")) INHERITS (\"$tableName\")$tableSpace;");
} else {
//Drop the constraint, we will recreate in in the next line
DB::query("ALTER TABLE \"$partition_name\" DROP CONSTRAINT \"{$partition_name}_pkey\";");
@ -1359,7 +1372,7 @@ class PostgreSQLDatabase extends SS_Database {
$this->dropTrigger(strtolower('trigger_' . $tableName . '_insert'), $tableName);
}
DB::query("ALTER TABLE $partition_name ADD CONSTRAINT \"{$partition_name}_pkey\" PRIMARY KEY (\"ID\");");
DB::query("ALTER TABLE \"$partition_name\" ADD CONSTRAINT \"{$partition_name}_pkey\" PRIMARY KEY (\"ID\");");
if($first){
$trigger.='IF';
@ -1367,13 +1380,58 @@ class PostgreSQLDatabase extends SS_Database {
} else
$trigger.='ELSIF';
$trigger.=' ( ' . $partition_value . ' ) THEN INSERT INTO ' . $partition_name . ' VALUES (NEW.*);';
$trigger.=" ($partition_value) THEN INSERT INTO \"$partition_name\" VALUES (NEW.*);";
if($indexes){
// We need to propogate the indexes through to the child pages.
// Some of this code is duplicated, and could be tidied up
foreach($indexes as $name=>$this_index){
if($this_index['type']=='fulltext'){
$fillfactor=$where='';
if(isset($this_index['fillfactor']))
$fillfactor='WITH (FILLFACTOR = ' . $this_index['fillfactor'] . ')';
if(isset($this_index['where']))
$where='WHERE ' . $this_index['where'];
DB::query("CREATE INDEX \"ix_{$partition_name}_{$this_index['name']}\" ON \"" . $partition_name . "\" USING " . $this->default_fts_cluster_method . "(\"ts_" . $name . "\") $fillfactor $where");
$ts_details=$this->fulltext($this_index, $partition_name, $name);
DB::query($ts_details['triggers']);
} else {
if(is_array($this_index))
$index_name=$this_index['name'];
else $index_name=trim($this_index, '()');
$query=$this->getIndexSqlDefinition($partition_name, $index_name, $this_index);
DB::query($query);
}
}
}
//Lastly, clustering goes here:
if($extensions && isset($extensions['cluster'])){
DB::query("CLUSTER \"$partition_name\" USING \"{$extensions['cluster']}\";");
}
}
$trigger.='ELSE RAISE EXCEPTION \'Value id out of range. Fix the ' . $tableName . '_insert_trigger() function!\'; END IF; RETURN NULL; END; $$ LANGUAGE plpgsql;';
$trigger.='CREATE TRIGGER trigger_' . $tableName . '_insert BEFORE INSERT ON "' . $tableName . '" FOR EACH ROW EXECUTE PROCEDURE ' . $tableName . '_insert_trigger();';
DB::query($trigger);
}
/*
* This will create a language if it doesn't already exist.
* This is used by the createOrReplacePartition function, which needs plpgsql
*/
public function createLanguage($language){
$result=DB::query("SELECT lanname FROM pg_language WHERE lanname='$language';")->first();
if(!$result){
DB::query("CREATE LANGUAGE $language;");
}
}
}